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driver core: platform: Annotate struct irq_affinity_devres with __counted_by

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Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct
irq_affinity_devres.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-hardening@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20231006201749.work.432-kees@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2023-10-06 13:17:49 -07:00 committed by Greg Kroah-Hartman
parent eb7581deb4
commit 36b2d7dd5a
1 changed files with 1 additions and 1 deletions
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2
drivers/base/platform.c
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@ -292,7 +292,7 @@ EXPORT_SYMBOL_GPL(platform_irq_count);
struct irq_affinity_devres {
unsigned int count;
unsigned int irq[];
unsigned int irq[] __counted_by(count);
};
static void platform_disable_acpi_irq(struct platform_device *pdev, int index)